Technical sources

• Godot stable release archive — version availability checked for the recommendation.
• Godot 2D in 3D and Sprite3D — hybrid presentation support.
• Godot AStar3D — graph pathfinding building block.
• Godot license — MIT license.
• Unity Engine and URP — comparison context.
• AutoSprite introduction and product page — documented export and directional animation capabilities, not independently tested here.
• GPT-6 Astra model documentation — separates input/output modalities from image-generation tool support.

The Old Road now provides a working browser combat prototype and an AutoSprite pilot quality check. It is not a production performance benchmark, a commercial budget quote, a full campaign or a Godot engine project. Design numbers and milestone durations are explicitly planning assumptions.